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1100A SERIES UPS

OWNERS / TECHNICAL MANUAL

Page Number:

3-11

MITSUBISHI ELECTRIC 1100 SERIES UPS

Figure 3.9

Input/Output Power Terminals

ALL POWER TERMINALS USE 5/16” (8 mm) DIAMETER BOLTS

BN

BP

Battery

Input

C40

A40

B40

AC Output

AC Input

C10

A10

B10

N10

Grounding

Bar

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Summary of Contents for 1100A Series

Page 1: ...UNINTERRUPTIBLE POWER SUPPLY SYSTEM MODEL 1100A SERIES OWNER S TECHNICAL MANUAL ...

Page 2: ...Preface Revision D 9 30 15 4GBA0035 ...

Page 3: ... BUTTON 2 1 2 2 LIQUID CRYSTAL DISPLAY 2 1 2 3 EXTERNAL SIGNAL TERMINAL BLOCK 2 7 2 4 EXTERNAL COMMUNICATION CONNECTOR 2 12 3 INSTALLATION AND OPERATION 3 1 3 1 UPS COMPONENTS 3 1 3 2 TRANSPORTATION AND INSTALLATION 3 2 3 3 HANDLING 3 2 3 4 INSTALLATION PROCEDURE 3 4 3 5 PROCEDURE FOR CABLE CONNECTIONS 3 8 3 6 OPERATING PROCEDURES 3 12 3 7 MAINTENANCE BYPASS SET UP PROCEDURES 3 13 4 RESPONSE TO UP...

Page 4: ...1 17 Table 1 5 Detail of Specifications 1 18 Table 1 6 Rating of Contactors and Fuses 1 19 Table 3 1 List of UPS component weights 3 1 Table 3 2 How to transport and install the system 3 2 Table 3 3 1 List of UPS weights Battery Built in Cabinet model 3 4 Table 3 3 2 List of UPS weights Standard Cabinet model 3 4 Table 3 4 Type and number of battery 3 5 Table 3 5 Maximum Permitted Fault Current 3 ...

Page 5: ... log 2 3 Figure 2 12 Power Converter Failure log 2 3 Figure 2 13 Power C onverter Failure log 2 3 Figure 2 14 Remote Local operation select 2 4 Figure 2 15 Date Time adjustment 2 4 Figure 2 16 Main screen 2 4 Figure 2 17 Measurement screen 2 4 Figure 2 18 Main screen Fault indication 2 5 Figure 2 19 Message screen 2 5 Figure 2 20 MENU Tree 2 6 Figure 2 21 External Signal Terminal Block NEC Class2 ...

Page 6: ...hows potentially hazardous situation or condition which could result in personal injury or death if not avoided CAUTION A caution symbol shows potentially hazardous situation or condition which could result in personal injury or equipment damage if not avoided NOTE A Note symbol shows the information the user or the service personnel should observe during the UPS operation or service work INHIBIT ...

Page 7: ...n and maintenance of the UPS and batteries Lethal voltages exist within the equipment during operation Observe all warning and cautions in this manual Failure to comply may result in serious injury or death Obtain a qualified service for this equipment as per instructions In no event will MITSUBISHI be responsible or liable for either indirect or consequential damage or injury that may come from t...

Page 8: ...hey may explode x Do not open or break the batteries Released electrolyte is toxic and harmful to the eyes and skin x A battery can present a risk of electrical shock and high short circuit current Observe the following minimum Safety Precautions when working on the batteries 1 Remove watches rings or other metal objects 2 Use tools with insulated handles to prevent inadvertent shorts 3 Wear rubbe...

Page 9: ...e suitably grounded Failure to ground the unit could lead to electrical shocks PRECAUTIONS FOR USE x If a unit fault abnormal odor or noise occurs turn off the UPS input switch Failure to do so could lead to fires x Do not insert blunt objects or fingers etc in the fan Failure to observe this could lead to injuries x Do not insert blunt objects or fingers etc into the unit s input output section F...

Page 10: ...skin or clothes wash it off thoroughly with clean water If electrolyte makes contact with the eyes rinse immediately and thoroughly with clean water and then see a doctor The presence of sulfuric acid in the eyes could lead to blindness and adherence to skin could lead to burns PRECAUTIONS FOR OPERATION x Operating method To obtain stable operation it is advisable that the UPS is operated on a con...

Page 11: ...ocation near devices that generate sparks or near heating elements APPLICATION If the UPS System is to be applied to support equipment that could affect human safety the following steps must be adhered to 1 Consult with Mitsubishi Electric Power Products Inc UPS Division 2 Special consideration of the overall back up power system configuration is required so that the Mitsubishi UPS System is not t...

Page 12: ... The relative humidity must be held between 5 and 95 There must be no condensation due to temperature changes 4 Altitude This equipment must not be applied at altitude that exceeds 2220m 7400ft above sea level 5 Dust Dust in the room where the UPS is installed must not exceed normal atmospheric dust levels In particular that dust should not include iron particles oils or fats or organic materials ...

Page 13: ...mended circuit breaker MCCB s specifications are as follows Table 1 2 Rating of AC input circuit breaker Capacity kVA Input Voltage VAC Maximum AC Input Rating AAC Recommended Breaker A 10 208 30 40 20 208 60 80 30 208 90 110 40 208 120 150 50 208 150 200 AC input and AC output over current protection and disconnect devices shall be field supplied and installed DC output over current protection an...

Page 14: ...p operate and maintain The 1100 Series UPS is configurable in five 5 kVA capacities 10 20 30 40 and 50kVA Specifications for each capacity appear in Section 1 5 The principles of operation described herein are applicable to all configurations The UPS cabinet design consists of two types described below a Battery Built in Cabinet 10 and 20kVA model only Type UP1133A AxxxSU 2 b Standard Cabinet 10 2...

Page 15: ...ired to the Power Converter Module to provide specified AC power to a load CONVERTER CHARGER The UPS components which contain the equipment and controls necessary to convert input AC power to regulated DC power required for battery charging and for supplying power to the Inverter INVERTER The UPS components which contain the equipment and controls necessary to convert DC power from the Converter C...

Page 16: ...e UPS inverters is used to power the load Referring to Figure 1 1 Input AC power is converted to DC by the Converter DC power is utilized to charge the UPS battery and to provide power to the Inverter The Inverter converts the DC power to clean AC power to supply the critical load The conversion inversion process eliminates any voltage transients or fluctuations existing in the input power before ...

Page 17: ... internal bypass line through 52S supplies the power In the event of a switching to the bypass line the power to the critical load will be uninterrupted The purpose of this internal bypass line is to route power to the critical load while the UPS module is de energized converter and inverter and during start up before the system is fully operational In the event of a load overcurrent the UPS trans...

Page 18: ...rns off or b Input power is restored after which the converter will power the inverter and critical load and simultaneously recharge the batteries A fully charged battery will provide power for the specified time at the rated load or longer at a reduced load When power is restored after a low battery shutdown the UPS converter automatically restarts operation the charger recharges the batteries an...

Page 19: ... and 4 AC input AC output DC input terminal and Grounding Bar is not shown in Figure 1 4 Refer to Figure 3 9 Battery Modules Bypass Module Power Converter Modules 1 LCD Touch Panel Monitor Display I F Module External I F PCB IOAU 12 or IOAU 17 Option NETCOM2 2 Maintenance Bypass Switch 3 AC input AC output DC input terminal 4 Grounding bar FRONT VIEW FRONT VIEW Covers removed ...

Page 20: ...tems 3 and 4 AC input AC output DC input terminal and Grounding Bar is not shown in Figure 1 5 Refer to Figure 3 9 FRONT VIEW FRONT VIEW Covers removed Bypass Module Power Converter Modules 1 LCD Touch Panel Monitor Display I F Module External I F PCB IOAU 12 or IOAU 17 Option NETCOM2 2 Maintenance Bypass Switch 3 AC input AC output DC input terminal 4 Grounding bar ...

Page 21: ...ernal I F Module 1 LCD Touch Panel Monitor Display 5 RESET switch 6 IL switch 2 Maintenance Bypass Switch 7 MAINTENANCE switch 8 Load on Bypass switch 9 Load on Inverter switch EPO button Option Modbus converter 11 External contact signal terminal block 10 External Communication RS232C Connector Option NETCOM2 External I F PCB IOAU 12 or IOAU 17 OPTION ...

Page 22: ...itch inhibit to start UPS 7 MAINTENANCE switch FOR SERVICE PERSONNEL ONLY This switch sets the UPS menu parameters 8 LOAD ON BYPASS switch FOR SERVICE PERSONNEL ONLY This switch is used to transfer the UPS from inverter to static bypass for maintenance purposes Do not operate it under normal operation Transfers will be locked out if the bypass voltage is more than r10 of nominal Uninterrupted swit...

Page 23: ...net Information Battery Built in Cabinet model UPS kVA CABLE ENTRY WIDTH in mm DEPTH in mm HEIGHT in mm WEIGHT lb kg HEAT LOSS kBTU h 10 BOTTOM 19 7 500 27 0 685 55 1 1400 683 310 2 3 20 BOTTOM 19 7 500 27 0 685 55 1 1400 728 330 4 6 Including Batteries Table 1 4 2 UPS Module Cabinet Information Standard Cabinet model UPS kVA CABLE ENTRY WIDTH in mm DEPTH in mm HEIGHT in mm WEIGHT lb kg HEAT LOSS ...

Page 24: ...z Frequency Stability 0 01 in free running mode Power Factor 0 9 nominal Power Factor range 0 9 1 0 lagging within output kW rating Voltage THD 2 typical THD at 100 linear load 5 typical THD at 100 non linear load Transient Response 3 typical at 100 load step 1 typical at loss return of AC power 5 typical at load transfer to from static bypass Transient Recovery 16 7 ms Voltage Unbalance 2 typical...

Page 25: ...ponent Rating 208V 3 phase 60 Hz UPS Rating kVA 10 20 30 40 50 CB3 Static Bypass Input Contactor 80A 80A 80A 80A 80A 52S Static Bypass Contactor 150A 150A 150A 150A 150A F6 F7 F8 AC Input Fuse 660V 60A F4 F5 Battery Input Fuse 660V 60A F9 F10 F11 AC Output Fuse 660V 60A F2 F3 Control Power 250V 2A F1 Control Power 500V 5A Internal Battery Input Fuse 500V 150A ...

Page 26: ...R OFF BUTTON When activated the Emergency Power Off EPO 1 function shuts down the UPS module The critical load will lose power and also shutdown The EPO function can be performed both locally or remotely 2 2 LIQUID CRYSTAL DISPLAY The Liquid Crystal Display LCD 2 touch panel indicates power flow measured values operational guidance data records and error messages The LCD panel has a back light whi...

Page 27: ... The display indicates the Startup and Shutdown guidance for the UPS system If this operation is PIN protected the user is required to enter the security PIN before the screen can be accessed When in remote mode the message REMOTE operating model will appear on this Screen The user cannot operate the start and stop functions without changing the setup from remote mode to local mode When bypass vol...

Page 28: ...t values Figure 2 7 Output values Figure 2 8 Measurement during Battery operation Figure 2 9 Each Power Converter Module Output Current B LOG FIGURE 2 1 0 FIGURE 2 13 Pressing the STATUS LOG icon on the SCREEN SELECT MENU up to 50 condition operation records will be displayed Press ĺ or ĸ button for page turning Pressing the BATT LOG icon number of battery operations and cumulative battery operati...

Page 29: ...ure the UPS inverter will be powered by the UPS batteries The following will be displayed on the main and measurement screen Indication of battery operation and remaining battery life Figure 2 16 Main screen Battery operation Figure 2 17 Measurement screen The LCD will display a battery low voltage message when the battery capacity is near depletion The End of Battery Discharge announcement is dis...

Page 30: ...enu is pressed 1 ALARM MESSAGE FIGURE 2 19 The display shows a fault code the description of the fault and a guidance of what action is to be taken by the user A maximum of 20 faults is displayed at one time Figure 2 19 Message screen 2 SILENCE ALARM This icon will appear when a failure occurs The audible alarm announcing the failure can be silenced by pressing this icon 3 MODULE NUMBER This icon ...

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Page 32: ...n of alarms and for remote access of certain UPS functions The layout of terminals is shown in Figure 2 21 and Figure 2 22 with a functional description of the input output port presented Optional output port DO1 to DO7 are user programmable but are factory default set being also shown in Figure 2 21 Optional input port DI1 to DI4 are user programmable but are factory default set being also shown ...

Page 33: ...OR FAULT BREAK㸧 DC12V POWER SUPPLY 12V For NETCOM2 P12VE N O 2 1 6 5 8 7 EGND DO2 LOAD ON INVERTER DO3 BATTERY OPERATION DO4 CONVERTER OPERATION DO5 BATTERY LOW VOLTAGE DO6 OVERLOAD DO1 LOAD ON BYPASS N O N O N O N O N O N O UPS 16 15 18 17 20 19 22 21 24 23 26 25 DO7 SUMMARY ALARM N O 28 27 FLT A MAJOR FAULT MAKE N O 4 3 N C FLT B MAJOR FAULT BREAK㸧 6 5 DC12V POWER SUPPLY 12V For NETCOM2 P12VE 30...

Page 34: ...pplied dry contact User supplied dry contact DI3 BATTERY TEMP HIGH DI1 INVERTER NOTE1 DI2 BYPASS NOTE2 EPO REMOTE EPO DI4 POWER DEMAND UPS 4 3 8 7 N O 10 9 N O 12 11 N O 14 13 N O EPO REMOTE EPO 2 1 N O NOTE1 Remote transfer operation from BYPASS to INVERTER NOTE2 Remote transfer operation from INVERTER to BYPASS UPS direct operation is required for INVERTER START STOP control ...

Page 35: ...make contact Activated when a major fault has occurred with the system Terminals 7 to 8 Major fault break contact Activated when a major fault has occurred with the system NOTE The UPS is equipped with a selectable output contact feature The above alarms are the default settings Contact MITSUBISHI ELECTRIC POWER PRODUCTS INC for setup information B Input Contacts for remote access of UPS External ...

Page 36: ...ccess IOAU 12 Terminals 3 to 4 Remote EPO contact input Used to perform a remote UPS Emergency Power Off EPO The load will be dropped NOTE The UPS is equipped with a selectable input contact item The above items are the default settings MITSUBISHI ELECTRIC POWER PRODUCTS INC for setup information CAUTION In all cases a switch having a protective cover is recommended in order to reduce the possibil...

Page 37: ...is shown in Figure 2 25 Figure 2 25 External communication connector NEC Class2 Pin 1 Not used Pin 2 RXD Receive data Pin 3 TXD Transmit data Pin 4 Not used Pin 5 GND Signal ground Pin 6 Not used Pin 7 Not used Pin 8 Not used Pin 9 Not used NOTE Consult MITSUBISHI ELECTRIC POWER PRODUCTS INC for details on DiamondLink monitoring software and its capabilities D SUB 9Pin male PCB IOAU 12 CN83 1 2 3 ...

Page 38: ...et 215 Power Converter Module 45 Bypass Module 25 Option I F Module 5 Battery tray Including six 6 Batteries 95 Tray only 5 Figure 3 1 UPS Components UPS Module cabinet Empty cabinet 19 7W x 27D x 55 1H in Bypass Module 19 3W x 25 2D x 7 6H in Part No THAU 06 Power Converter Module 19 3W x 25 2D x 5 9H in Part No PMAU 02 Option I F Module 14 8W x 12 2D x 1 5H in Part No 3AYA0556G001 Battery tray 7...

Page 39: ...binet as shown in Figure 3 2 Fix the UPS unit in place using the four 4 leveling feet Using the two 2 brackets with pre drilled hole 0 47 Diameter anchor the UPS using appropriate hardware Not provided NOTE Do not transport in a horizontal position Cabinets should be maintained upright within 15 of the vertical during handling 3 3 HANDLING The UPS is shipped in export packaging Remove the UPS from...

Page 40: ...1100A SERIES UPS OWNERS TECHNICAL MANUAL Page Number 3 3 MITSUBISHI ELECTRIC 1100 SERIES UPS Figure 3 2 Handling 6 1 3 4 2 Leveling feet Brackets 5 ...

Page 41: ... 50 Weight lb 313 357 375 419 463 B Minimum clearance required for ventilation Right side 1 0 25 mm not required when sidecars are used Left side 1 0 25 mm not required when sidecars are used Back side 8 0 203 mm refer to Figure 3 4 for Battery Built in Cabinet Model Top side 16 0 406 mm C Space requirement for routine maintenance Allow for the following space at the time of installation Front 31 ...

Page 42: ...batteries 2 When installing or replacing batteries install or replace with the same number and type per Table 3 4 Table 3 4 Type and number of battery UPS Capacity Type Manufacturer Number 10kVA NPX 80FR EnerSys 24 20kVA NPX 80FR EnerSys 24 3 CAUTION Do not dispose the battery or batteries in fire The battery may explode WARNING CAUTION 31 5 800mm For Maintenance 8 203mm For Air exhaust UPS Top Vi...

Page 43: ...g or disconnecting battery terminals D External Battery 10kVA 20kVA 30kVA 40kVA and 50kVA Please refer to the following when installing and maintaining batteries 1 The customer shall refer to the battery manufacturer s installation manual for battery installation and maintenance instructions 2 The maximum permitted fault current from the remote battery supply and the DC voltage rating of the batte...

Page 44: ...s Module 1 Remove Front Cover 2 Installing Modules Quantity of Modules Bypass Module Power Converter Module Battery Tray 10kVA One 1 One 1 Four 4 or None 20kVA One 1 Two 2 Four 4 or None 30kVA One 1 Three 3 None 40kVA One 1 Four 4 None 50kVA One 1 Five 5 None 3 Fastening four 4 screws in each module 4 Insert control wires 5 Close front cover SCREWDRIVER LOCK Turn 90 deg Battery Built in cabinet mo...

Page 45: ...conductor is recommended NOTE UPS power terminals are supplied with stud type fittings It is recommended that compression lugs be used to fasten all input output power cables Refer to Table 3 7 for recommended compression lugs and appropriate crimping tool Table 3 6 Recommended Cable Size and Torque Requirements UPS Input Side 1 DC Input Side Output Side 1 Capacity kVA Cable 2 Size Torque in lbs C...

Page 46: ...TC38 GREEN 11 1 0 B BURNDY YA25L 2TC38 PINK 12 2 0 B BURNDY YA26L 2TC38 BLACK 13 3 0 B BURNDY YA27L 2TC38 ORANGE 14 4 0 B BURNDY YA28L 2TC38 PURPLE 15 NOTE When using crimp type lugs the lugs should be crimped to the specifications given in the manufacturer s instructions for both crimp tool and lug Table 3 8 Recommended Hardware UPS Capacity Bolt size Flat washer size Split lockwasher size Nut si...

Page 47: ...net model 10kVA 20kVA 30kVA 40kVA 50kVA UPS Terminals INPUT A10 B10 C10 N10 Terminals OUTPUT A40 B40 C40 N10 Output AC Input CB3 52C 52RC CONVERTER INVERTER UPS Module 72B 52S Battery Cabinet DC Input Terminals BP BN Static Transfer Switch Terminals INPUT A10 B10 C10 N10 Terminals OUTPUT A40 B40 C40 N10 Battery CB3 Static Transfer Switch 52C 52RC CONVERTER INVERTER 72B 52S Output AC Input DC Input...

Page 48: ...AL MANUAL Page Number 3 11 MITSUBISHI ELECTRIC 1100 SERIES UPS Figure 3 9 Input Output Power Terminals ALL POWER TERMINALS USE 5 16 8 mm DIAMETER BOLTS BN BP Battery Input C40 A40 B40 AC Output AC Input C10 A10 B10 N10 Grounding Bar ...

Page 49: ...rning 4 2 The LCD panel boots up automatically and the screen will show that the load is powered through the bypass line 3 On the LCD panel press the START STOP button to proceed UPS start up Refer to 2 2 1 4 Follow the STARTUP GUIDANCE accordingly until the completion of the inverter startup B UPS Shutdown Procedure NOTE When REMOTE OPERATION MODE is displayed on the LCD panel the inverter start ...

Page 50: ...een de energized Internal devices may be hot C EPO Emergency Power Off Procedure If an all power supply shutdown is required in an emergency situation press the EPO button on the front panel The UPS will be shutdown and no power is supplied to the load WARNING With EPO operation although all output power from the UPS is shutdown it is necessary to manually open the input circuit breaker user suppl...

Page 51: ...source UPS can be shutdown B Transfer of load from external maintenance bypass to inverter 1 Verify that the external input circuit breaker is closed 2 Confirm via the flow diagram on the LCD that the UPS output is fed from the static bypass line 3 Close UPS output circuit breaker in MBP 4 Open the Maintenance bypass circuit breaker in MBP 5 On the LCD panel press the START STOP button to procede ...

Page 52: ...faults happen contact the Authorized Mitsubishi Electric Service Representatives or call Mitsubishi Electric at 1 800 887 7830 NOTE The error code indicated on the LCD display panel when an UPS alarms is very important In order to reduce repair time please include this information along with the operation and load status for all correspondence to Mitsubishi Electric Field Service Group UPS FAULT A...

Page 53: ...equal to 80 of nominal capacity Replace battery if its capacity is within this percentage B UPS Component Parts UPS components have a defined life expectancy Capacitors Filters etc Contact Mitsubishi Electric Power Products Inc or its authorized service representatives for a complete parts replacement schedule Recommended replacement time interval varies with operating environment Contact Mitsubis...

Page 54: ... 6 FAULT CODES This section covers fault codes their description and required action In the event of a fault occurring Verify and record the occurrence of the alarm Note details of alarm message displayed on the LCD display panel Contact Mitsubishi Electric Power Products Inc at 1 800 887 7830 ...

Page 55: ...nuous sound Alarm UA819 REMOTE BUTTON ABNORMAL Remote start signal is being received continuously for a considerable time Intermittent sound Alarm UA820 LOCAL BUTTON ABNORMAL Local start or stop signal is being received continuously for a considerable time CALL SERVICE ENGINEER Intermittent sound Alarm UA821 TRANSFER INHIBITION The UPS cannot transfer to the bypass because the inverter output is n...

Page 56: ...Intermittent sound Battery abnormal UF163 BATTERY VOLTAGE ABNORMAL All converter modules have detected battery voltage abnormal CALL SERVICE ENGINEER Intermittent sound Battery abnormal UF202 OUTPUT UNDERVOLTAGE Output voltage dropped CALL SERVICE ENGINEER Intermittent sound Minor UF253 UPS CONTROL CIRCUIT ERROR Discrepancy between output voltage and bypass voltage during bypass operation CALL SER...

Page 57: ...lt condition CALL SERVICE ENGINEER Intermittent sound Minor UF349 MODULE MAJOR FAULT All Power converter modules have detected major fault condition CALL SERVICE ENGINEER Continuous sound Major UF351 CONTROL POWER SUPPLY ABNORMAL Control power supply voltage is below the specified level Bypass CALL SERVICE ENGINEER Intermittent sound Minor UF352 CONTROL POWER SUPPLY ABNORMAL Control power supply v...

Page 58: ... The emergency stop was activated by the EPO switch or an external contact Alarm MA824 72B OPEN The battery disconnect contactor 72B open Alarm MA825 BATTERY ABNORMAL Battery voltage is less than end voltage at startup Alarm MA828 COOLING FAN ABNORMAL Rotation sensor detect fan abnormal Alarm MA834 BATTERY DEPLETED The battery voltage has reached the depleted level Major End of Discharge MA836 INV...

Page 59: ...actual current Minor MF206 UPS CONTROL CIRCUIT ERROR Discrepancy between output voltage and external voltage bypass common ac bus Major MF208 UPS CONTROL CIRCUIT ERROR Cross current is abnormal Major MF210 52C ABNORMAL Error to open the contactor 52C Major MF213 OVERTEMPERATURE Heatsink temperature exceeds thermal settings Major MF214 COOLING FAN ABNORMAL Thermal relay activated protection Major M...

Page 60: ...r Note 1 1 Major is defined as a major failure Load transferred from the inverter circuit to the static bypass line 2 Minor is defined as a minor failure UPS continues to operate normally but the cause of alarm must be identified Note 2 Code indication means A Alarm F Failure 0 Rectifier circuit failure 1 DC circuit failure 2 Inverter circuit failure 3 Control circuit failure 4 Bypass system failu...

Page 61: ...ster your UPS for warranty purposes please complete the warranty registration form and fax it to the Mitsubishi Electric UPS Division Service Department fax line shown on the registration form Next page For warranty purposes it is essential that any and all service work that may be required on your Mitsubishi brand UPS equipment is performed by a Mitsubishi Electric Authorized Service Center The u...

Page 62: ...re Date Which ONE of These Best Describes Your Organization s Primary Business Classification Number of Employees at This Location is Energy Producer __ Utility __ Alternate Energy Manufacturing Co __ OEM __ Process __ Consumer Goods __ Electronics __ Power Quality Equipment __ Commercial Business __ Electrical Contractor __ Healthcare __ Internet __ Education Univ Service Service __ Consulting __...

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